db.c

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/*!
 * \file db/dbmi_client/db.c
 *
 * \brief DBMI Library (client) - open/close driver/database connection
 *
 * (C) 1999-2009 by the GRASS Development Team
 *
 * This program is free software under the GNU General Public
 * License (>=v2). Read the file COPYING that comes with GRASS
 * for details.
 *
 * \author Joel Jones (CERL/UIUC), Radim Blazek
 */
 
#include <grass/dbmi.h>
#include <grass/glocale.h>
#include "macros.h"
 
/*!
   \brief Open driver/database connection
 
   \param drvname driver name
   \param dbname database name
 
   \return pointer to dbDriver structure
   \return NULL on failure
 */
dbDriver *db_start_driver_open_database(const char *drvname, const char *dbname)
{
    dbHandle handle;
    dbDriver *driver;
 
    G_debug(3, "db_start_driver_open_database(): drvname='%s', dbname='%s'",
            drvname, dbname);
 
    db_init_handle(&handle);
 
    driver = db_start_driver(drvname);
    if (driver == NULL) {
        G_warning(_("Unable to start driver <%s>"), drvname);
        return NULL;
    }
    db_set_handle(&handle, dbname, NULL);
    if (db_open_database(driver, &handle) != DB_OK) {
        G_warning(_("Unable to open database <%s> by driver <%s>"), dbname,
                  drvname);
        db_shutdown_driver(driver);
        return NULL;
    }
 
    return driver;
}
 
/*!
   \brief Close driver/database connection
 
   \param driver db driver
 
   \return DB_OK or DB_FAILED
 */
int db_close_database_shutdown_driver(dbDriver *driver)
{
    int status;
 
    status = db_close_database(driver);
    G_debug(2, "db_close_database() result: %d  (%d means success)", status,
            DB_OK);
 
    if (db_shutdown_driver(driver) != 0) {
        status = DB_FAILED;
        G_debug(2, "db_shutdown_driver() failed");
    }
 
    return status;
}